1 files changed, 143 insertions, 0 deletions
diff --git a/common/tlv.h b/common/tlv.h
new file mode 100644
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--- /dev/null
+++ b/common/tlv.h
@@ -0,0 +1,143 @@
+/* tlv.h - Tag-Length-Value Utilities
+ *	Copyright (C) 2004 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of either
+ *
+ *   - the GNU Lesser General Public License as published by the Free
+ *     Software Foundation; either version 3 of the License, or (at
+ *     your option) any later version.
+ *
+ * or
+ *
+ *   - the GNU General Public License as published by the Free
+ *     Software Foundation; either version 2 of the License, or (at
+ *     your option) any later version.
+ *
+ * or both in parallel, as here.
+ *
+ * This file is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef SCD_TLV_H
+#define SCD_TLV_H 1
+
+#include "membuf.h"
+
+
+enum tlv_tag_class {
+  CLASS_UNIVERSAL = 0,
+  CLASS_APPLICATION = 1,
+  CLASS_CONTEXT = 2,
+  CLASS_PRIVATE =3
+};
+
+enum tlv_tag_type {
+  TAG_NONE = 0,
+  TAG_BOOLEAN = 1,
+  TAG_INTEGER = 2,
+  TAG_BIT_STRING = 3,
+  TAG_OCTET_STRING = 4,
+  TAG_NULL = 5,
+  TAG_OBJECT_ID = 6,
+  TAG_OBJECT_DESCRIPTOR = 7,
+  TAG_EXTERNAL = 8,
+  TAG_REAL = 9,
+  TAG_ENUMERATED = 10,
+  TAG_EMBEDDED_PDV = 11,
+  TAG_UTF8_STRING = 12,
+  TAG_REALTIVE_OID = 13,
+  TAG_SEQUENCE = 16,
+  TAG_SET = 17,
+  TAG_NUMERIC_STRING = 18,
+  TAG_PRINTABLE_STRING = 19,
+  TAG_TELETEX_STRING = 20,
+  TAG_VIDEOTEX_STRING = 21,
+  TAG_IA5_STRING = 22,
+  TAG_UTC_TIME = 23,
+  TAG_GENERALIZED_TIME = 24,
+  TAG_GRAPHIC_STRING = 25,
+  TAG_VISIBLE_STRING = 26,
+  TAG_GENERAL_STRING = 27,
+  TAG_UNIVERSAL_STRING = 28,
+  TAG_CHARACTER_STRING = 29,
+  TAG_BMP_STRING = 30
+};
+
+
+struct tlv_builder_s;
+typedef struct tlv_builder_s *tlv_builder_t;
+
+/*-- tlv.c --*/
+
+/* Locate a TLV encoded data object in BUFFER of LENGTH and return a
+   pointer to value as well as its length in NBYTES.  Return NULL if
+   it was not found or if the object does not fit into the buffer. */
+const unsigned char *find_tlv (const unsigned char *buffer, size_t length,
+                               int tag, size_t *nbytes);
+
+
+/* Locate a TLV encoded data object in BUFFER of LENGTH and return a
+   pointer to value as well as its length in NBYTES.  Return NULL if
+   it was not found.  Note, that the function does not check whether
+   the value fits into the provided buffer.*/
+const unsigned char *find_tlv_unchecked (const unsigned char *buffer,
+                                         size_t length,
+                                         int tag, size_t *nbytes);
+
+/* ASN.1 BER parser: Parse BUFFER of length SIZE and return the tag
+   and the length part from the TLV triplet.  Update BUFFER and SIZE
+   on success. */
+gpg_error_t parse_ber_header (unsigned char const **buffer, size_t *size,
+                               int *r_class, int *r_tag,
+                               int *r_constructed,
+                              int *r_ndef, size_t *r_length, size_t *r_nhdr);
+
+
+/* Return the next token of an canonical encoded S-expression.  BUF
+   is the pointer to the S-expression and BUFLEN is a pointer to the
+   length of this S-expression (used to validate the syntax).  Both
+   are updated to reflect the new position.  The token itself is
+   returned as a pointer into the original buffer at TOK and TOKLEN.
+   If a parentheses is the next token, TOK will be set to NULL.
+   TOKLEN is checked to be within the bounds.  On error an error code
+   is returned and no pointer is not guaranteed to point to
+   a meaningful value.  DEPTH should be initialized to 0 and will
+   reflect on return the actual depth of the tree. To detect the end
+   of the S-expression it is advisable to check DEPTH after a
+   successful return. */
+gpg_error_t parse_sexp (unsigned char const **buf, size_t *buflen,
+                        int *depth, unsigned char const **tok, size_t *toklen);
+
+
+/*-- tlv-builder.c --*/
+
+tlv_builder_t tlv_builder_new (int use_secure);
+void tlv_builder_add_ptr (tlv_builder_t tb, int class, int tag,
+                          void *value, size_t valuelen);
+void tlv_builder_add_val (tlv_builder_t tb, int class, int tag,
+                          const void *value, size_t valuelen);
+void tlv_builder_add_tag (tlv_builder_t tb, int class, int tag);
+void tlv_builder_add_end (tlv_builder_t tb);
+gpg_error_t tlv_builder_finalize (tlv_builder_t tb,
+                                  void **r_obj, size_t *r_objlen);
+
+/* Wite a TLV header to MEMBUF.  */
+void put_tlv_to_membuf (membuf_t *membuf, int class, int tag,
+                        int constructed, size_t length);
+
+/* Count the length of a to be constructed TLV.  */
+size_t get_tlv_length (int class, int tag, int constructed, size_t length);
+
+
+
+
+#endif /* SCD_TLV_H */